IntelliJ 14 not able to run scala test - intellij-idea

Question

Recently, my newly created IntelliJ project failed to run scala test with following error in console:
2015-07-30 09:46:56,731 [72575363] ERROR -
llij.ide.plugins.PluginManager -
org/jetbrains/idea/maven/project/MavenProjectsManager
java.lang.NoClassDefFoundError:
org/jetbrains/idea/maven/project/MavenProjectsManager
at org.jetbrains.plugins.scala.testingSupport.test.AbstractTestRunConfiguration.provideDefaultWorkingDir(AbstractTestRunConfiguration.scala:122)
at org.jetbrains.plugins.scala.testingSupport.test.AbstractTestRunConfiguration.initWorkingDir(AbstractTestRunConfiguration.scala:116)
at org.jetbrains.plugins.scala.testingSupport.test.scalatest.ScalaTestConfigurationProducer.createConfigurationByLocation(ScalaTestConfigurationProducer.scala:62)
at org.jetbrains.plugins.scala.testingSupport.test.AbstractTestConfigurationProducer$class.createConfigurationByElement(AbstractTestConfigurationProducer.scala:30)
at org.jetbrains.plugins.scala.testingSupport.test.TestConfigurationProducer.createConfigurationByElement(TestConfigurationProducer.scala:18)
at org.jetbrains.plugins.scala.testingSupport.test.TestConfigurationProducer.setupConfigurationFromContext(TestConfigurationProducer.scala:33)
at org.jetbrains.plugins.scala.testingSupport.test.TestConfigurationProducer.setupConfigurationFromContext(TestConfigurationProducer.scala:18)
at com.intellij.execution.actions.RunConfigurationProducer.createConfigurationFromContext(RunConfigurationProducer.java:87)
at com.intellij.execution.actions.RunConfigurationProducer.findOrCreateConfigurationFromContext(RunConfigurationProducer.java:170)
at com.intellij.execution.actions.PreferredProducerFind.getConfigurationsFromContext(PreferredProducerFind.java:106)
at com.intellij.execution.actions.PreferredProducerFind.findConfigurationFromContext(PreferredProducerFind.java:131)
at com.intellij.execution.actions.PreferredProducerFind.createConfiguration(PreferredProducerFind.java:43)
at com.intellij.execution.actions.ConfigurationContext.createConfiguration(ConfigurationContext.java:119)
at com.intellij.execution.actions.ConfigurationContext.getConfiguration(ConfigurationContext.java:112)
at com.intellij.execution.actions.BaseRunConfigurationAction.update(BaseRunConfigurationAction.java:194)
at com.intellij.openapi.actionSystem.AnAction.beforeActionPerformedUpdate(AnAction.java:243)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareUpdate(ActionUtil.java:111)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction(IdeKeyEventDispatcher.java:620)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.d(IdeKeyEventDispatcher.java:483)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.java:213)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:538)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:382)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
2015-07-30 09:46:56,731 [72575363] ERROR -
llij.ide.plugins.PluginManager - IntelliJ IDEA 14.1.4 Build
IU-141.1532.4 2015-07-30 09:46:56,731 [72575363] ERROR - llij.ide.plugins.PluginManager - JDK: 1.8.0_31 2015-07-30
09:46:56,731 [72575363] ERROR - llij.ide.plugins.PluginManager - VM:
Java HotSpot(TM) 64-Bit Server VM 2015-07-30 09:46:56,731 [72575363]
ERROR - llij.ide.plugins.PluginManager - Vendor: Oracle Corporation
2015-07-30 09:46:56,731 [72575363] ERROR -
llij.ide.plugins.PluginManager - OS: Linux
I searched around, but couldn't find anything useful. Anyone had the same issue, and knows how to fix it?

Answer 1

Found it.
Install the "Maven Integration" plugin from the settings.
If you're wondering how I solved that, I saw that there was a strange error even if you try to create a new spec2 configuration.
This was the error in my console:
[ 73962] ERROR - llij.ide.plugins.PluginManager - org/jetbrains/idea/maven/project/MavenProjectsManager
java.lang.NoClassDefFoundError: org/jetbrains/idea/maven/project/MavenProjectsManager
at org.jetbrains.plugins.scala.testingSupport.test.AbstractTestRunConfiguration.provideDefaultWorkingDir(AbstractTestRunConfiguration.scala:122)
The org.jetbrains.idea.maven.project.MavenProjectsManager class is in the maven plugin.
Installing solved that problem and this one.